Abstract
The operation of a proportional counter filled with pure helium gas was examined at low temperatures higher than 13 K. The counter was cooled in a cryostat by using adiabatic expansion of high-pressure helium gas. It was ensured that the counter works stably at temperatures lower than 15 K but it fails to operate at higher temperatures. This counter was applied to the observation of conversion electron Mössbauer spectra.
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